Quantity   Component name
1 × ATTINY85 Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
1 × Battery Holder http://uk.farnell.com/renata/vbh2032-1-lf/holder-battery-vertical-for-cr/dp/1216359
1 × SMD Sounder http://uk.farnell.com/multicomp/mcabt-458-rc/sounder-75db-1-25v-smd/dp/2433031
1 × Hole Through Sounder http://uk.farnell.com/pro-signal/abt-407-rc/transducer-electro-mech-audio/dp/2098835
1 × REED Sensor with NO/NC contacts http://uk.farnell.com/hamlin/mdrr-dt-15-30-u/switch-reed-spdt/dp/1608148
1 × 3mm LED IF 20mA - 2.2 V Forward Voltage
1 × Capacitor 100nF Ceramic Capacitor
1 × Resistor 10k For SMD 805
1 × Resistor 220R For SMD 805
1 × DIL header. 8 pins
1 × Diode Used for reverse polarity protection. Can be misses. Use germanium or Schottky diode over silicon so drop is lower only about 0.3V
1 × CR2032 Battery http://uk.farnell.com/energizer/628747/coin-cell-limno2-3v-cr2032-2pk/dp/2543052
1 × Earth Magnet